Hi Greg.

16-Oct-03 10:39:00, Greg Mayman wrote to Jasen Betts


 JB>> I've heard of what I assume are regulators with voltage doublers
 JB>> etc inside them.  that'd help the output voltage at low revs. I
 JB>> think intended as a retrofit as in original equipment winding the
 JB>> field with a shorter, thicker, wire would have the same effect.

 GM> OTOH they could be using voltage doubling for the field supply.
 GM> That would make sense, although the caps would still be large.

That's what I meant... to me the "output" of an automotive voltage
regulator is the field supply.

field supply here peaks at about 500ma.  maybe they use an inductor based
step-up?  (seems like a good bet since engine compartments are the sort of
a tough environment that kills electrolytic capacitors,

  hmmm, also the polarity of the field isn't important...
  maybe something like this.

    ______     _ ___________|/|_____________to field
    bat+  `\   /"   |_      |\|   |     |
           ~~T~~     _)||        _|_    |
    _________|       _)||       `\./'  _L_
  pwm control        _)||       ~~T~~  ~T~
  signal      ...___|_____________|_____|
                         __|__
                         ////

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